September weather forecastRochford, SD
September
Weather in September
September brings an end to the hot summer months in Rochford as the city begins transitioning into fall. A significant drop in temperature is observed marking changing seasons. The steep decrease in rainfall from 1.5" (38mm) in August to 0.67 inch becomes the defining feature of September. As the fall colors start taking over the city landscapes, residents and tourists alike look forward to the delightful change in weather. Despite the changing weather, September is generally characterized by clear skies and ample sunshine.Temperature
September's arrival aligns with a minor decrease in average high-temperatures, from August's moderately hot 80.1°F (26.7°C) to an agreeable 71.8°F (22.1°C). In Rochford, an average nighttime temperature of 51.3°F (10.7°C) is expected during September.Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 51%.Rainfall
In Rochford, during September, the rain falls for 6.8 days and regularly aggregates up to 0.67" (17mm) of precipitation. Throughout the year, there are 96.1 rainfall days, and 14.02" (356mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rochford are January through June, September through December. September is the first month it typically snows in Rochford, South Dakota. Throughout September, in the average 0.3 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 66.6 snowfall days, and 34.53" (877mm) of snow is accumulated.Daylight
The average length of the day in September in Rochford is 12h and 29min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:30 pm. On the last day of September, in Rochford, sunrise is at 6:52 am and sunset at 6:36 pm MDT.
Sunshine
In September, the average sunshine in Rochford is 10.5h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The average daily UV index of 4 in September transforms into the following instructions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Experience reduced UV exposure by about half when donning a wide-brim hat. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rochford, SD
- Average high temperature in September: 71.8°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in September: 51.3°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (15.4°F).
Average pressure in September
Rochford, SD
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in September
Rochford, SD
- Average wind speed in September: 8.5mph
The windiest month (with the highest average wind speed) is October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.6mph).
Average humidity in September
Rochford, SD
- Average humidity in September: 51%
The months with the highest relative humidity are January and February (79%).
The months with the lowest relative humidity are August and September (51%).
Average rainfall in September
Rochford, SD
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Rochford, SD
- Average rainfall days in September: 6.8 days
The month with the highest number of rainy days is June (14.2 days).
The month with the least rainy days is November (2.7 days).
Average snowfall in September
Rochford, SD
- Average snowfall in September: 0.04"
The month with the highest snowfall is April (6.54").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Rochford, SD
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Rochford, SD
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 10h and 30min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in September
Rochford, SD
- Average sunshine days in September: 19.6 days
The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in September
Rochford, SD
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Rochford, SD
- Average cloud cover in September: 18
The months with the most cloud cover are February and April (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Rochford, SD
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
